#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main()
{
    int s = 0;
    scanf("%d", &s);
    int t1 = s / 1.0;
    int t2 = s / 10.0 + 10;
    if (t1 < t2)
    {
        printf("w\n");
    }
    else
    {
        printf("v\n");
    }
    return 0;
}